Underline errors in NEW files with #define not working?

I'm having problems with the visual studio 2010 edi开发者_JAVA技巧tor. Since today, visual studio won't underline errors any more if I use #define like so:

#ifndef TEST_H
#define TEST_H
class foo{
blabla
}
#endif

If i remove the defining commands, the errors show up.

The weird thing is, I have other files in my project with the exact same setup and error underlining works just fine in those but not the new files that I'm creating?

I have tried resetting settings and re-installing but none of it helps.

I have also tried doing this in other projects and I have the same issue.

Just wondering if anyone had a similar issue and can shed some light on this?

The cause for this isn't an exact science, and I've seen/experienced it before. In my case, dumping the intellisense database fixed it.